Chair.



N0. fifififlzi Patented Feb; I2, IQOI. W. M. BOENNINGu CHAIR.

(Application filed Aug. 17 1900.) (m Wladel.)

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3mm) WM W! Mom my Wm. MBJZE'. Patented Feb. l2, I90l. W.-M. BOENNINGCHAIR. (Application filed Aug. 17, 1900.

2 Sheetss 2 (W0 Wlodal.)

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initnn rains "WILLIAM Ill. BOENNING, OF PORT W'ASHINGTON, WISCONSIN.

SPEGIFIGATMDN forming part of Letters Patent No. 668,125, dated February12, 1901.

Application filed August 1'],

To all whmn it may concern:

Be it known that LWILLIAM M. BOENNING, a citizen of the United States,and a resident of Port lVashington, in the county of Ozaukee and Stateof Wisconsin, have invented certain new and useful Improvements inChairs; and I do hereby declare that the following is a full, clear, andexact description thereof.

My invention has for its object to provide simple economical chairshaving vertically-adjustable swing-rocker pivot-seats; and it consistsin certain peculiarities of construction and combination of partshereinafter particularly set forth with reference to the accompanyingdrawings and subsequently claimed.

Figure l of the drawings represents an elevation of my improved chairmechanism, partly in section; Fig. 2, a detail elevation of aswing-rocker constituting part of said mechanism; Fig. 3, a detail planview, partly in section, on line 3 in the first figure of the series;and Fig. l, a plan view of the aforesaid mechanism.

Referring by letter to the drawings, I show a base-casting in the formof a smooth-bore sleeve A, having inclined radially-disposed wings I),made to lit a corresponding series of wooden legs I3, to which they arebolted or otherwise rigidly connected. The upper end of the sleeveprojecting above the Wings is reduced and annnlarly grooved to engagewith the inwardly-flanged lower ends of sections 0, constituting atwo-part housing, that has its support on said sleeve. A rivet or screw0 engages ears (Z of the housing-sections to hold these sectionstogether, and said sections are provided with bearings for a spindle Dof a spurpinion E, incased by said housing. The hubs c of hand-wheels F,fast on the spindle D, abut the exterior of the housing and aid inholding its sections together. Each hand-Wheel hub may be made to slipon the spindle and a set-screwfemployed to hold said wheel in workingposition, as shown in Fig. 3, this construction facilitating the takingapart of the chair mechanism herein set forth.

Loose in the separable housing and its supporting-sleeve A is post F,depending from a spider G, with which it has rigid connection, and aportion of this post is made to constitute a rack, with which the pinionE 1900. Serial No. 27,128- (No model.)

has mesh, said post being held in verticallyadjusted position by aspring-controlled belt 11, loose in said housing.

Swing-rockers I connect arms of spider G with depending arms g of a pairof parallel brackets J, bolted or otherwise made fast to a spacing-blockK, and yokes L are in pivotal connection with lug branches h of saidrockers. Each of the rockers has a pair of links joined by a spacerrigid therewith, as best shown in Fig. 2. A spiral spring M has hookconnection with a lug of one of the yokes and similar connection with arod N, engaging the opposite yoke, a nut P being run on thescrew-threaded outer end of the rod against the corresponding yoke toregulate tension of the spring.

The ends of the parallel brackets are pro vided with apertures forscrews by which the frame of a chair-seat is made fast to said arms, andfrom what is herein shown and described it will be readily understoodthat the chair-seat is not only vertically adjustable in practice, butcapable of pivotal swing and easy rocking motion at the pleasure of theoccupant.

While the housing herein set forth has free rotary motion on the centralsleeve, it is obvious that the engagement of the groove of said sleeveby the flange of said housing will prevent separation of the aforesaidhousing and parts in connection therewith from the aforesaid sleeve whenthe chair is lifted by its seat.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The combination of a spider, means for supporting the spider, parallelchair-seat brackets, swing-rockers connecting said spider and brackets,each rocker comprising a pair of links, a spacer therewith, and lugbranches, yokes in pivotal connection with the lug branches of therockers, and a spring in adjustable tension connection with the yokes.

In testimony that I claim the foregoing I have hereunto set my hand, atPort Washing ton, in the county of Ozaukee and State of l/Visconsin, inthe presence of two witnesses.

WILLIAM M. BOENNING.

Witnesses:

A. A. FARMER, A. AOKERMANN.

